I am sorry, I do not understand your question. Please clarify "subatomic".
If you actually meant subcritical, it is when they make a test device that is deliberately designed to never become critical. Such a device cannot produce a nuclear yield, but they can still make measurements on it (e.g. neutron flux peak, x-ray flux) helpful in designing functional nuclear weapons.
Nuclear weapons are dangerous because they can kill thousands in the initial blast, and leave an area dangerously radioactive for decades. Any who are exposed to this radiation may either die shortly after, or receive cancer.
The Hiroshima and Nagasaki bombs were firecrackers compared to a standard warhead today. The Hiroshima bomb was about 20 kilotons - the equivalent of 20,000 tons of TNT. Subsequently thermo-nuclear devices were perfected, and yields of 50 MEGAtons are attained. Big enough to annihilate everything for a fifty to one hundred mile radius from the blast. So big in fact that its pointless to develop anything stronger, as existing weapons will have a blast radius extending beyond the atmosphere of the planet, and any additional power would be largely vented into space. In the 1950s US Army doctrine called for preparing for a "nuclear" battlefield. As part of that nuclear artillery pieces were developed, to fire out limited-yield tactical nuclear shells about ten miles, with a small enough blast that the gun crew could survive. Similar nuclear ammunition was developed by the Navy to be fired from the main battery of battleships. Today such limited-yield tactical nuclear weapons are mounted on short range missiles. There's also the neutron bomb, which emits mostly radiation to kill all living creatures without the messy blast and fire, leaving infrastructure intact for the benefit of ground forces moving in afterward.
Blast Corps happened in 1997.
Blast Chamber happened in 1996.
Blast From The Past
Yes the tsunami did trigger the nuclear blast because the water got into the nuclear reactor and buggered it up
no
yes, thousands
The blast effects (which is all the question as worded asks about) would be the same as the blast effects of a weight of TNT identical to the nuclear bomb's yield (by definition). However a nuclear bomb has additional effects that the TNT doesn't, but as this question only asked about blast effects, I won't visit them.
Blast, always blast.
Correct answer is blast effect
none
35km
A direct nuclear blast - nothing. However it is said that cockroaches would possibly survive radiation where other animals would be killed.
blast
Twinkies
Blast